/Engine/Plugins/FX/Niagara/Source/NiagaraEditor/Public/NiagaraNodeReadDataSet.h
Apply any node-specific logic to determine if it is safe to add this node to the graph. This is meant to be called only in the Editor before placing the node.
virtual bool CanAddToGraph ( [UNiagaraGraph](API\Plugins\NiagaraEditor\UNiagaraGraph) * TargetGraph, [FString](API\Runtime\Core\Containers\FString) & OutErrorMsg ) const